B0116 Side airbag firing circuit open (Toyota)

Side airbag squib circuit open, SRS light on

B0116 in short

On Toyota vehicles, B0116 means the airbag computer found an open circuit in a front seat side airbag firing circuit, and Toyota pairs it with B0111. The SRS light comes on and that airbag may not deploy. Toyota's fix on Siennas is an updated floor harness. Have it checked soon.

The airbag computer checks every firing circuit when the car starts. B0116 is stored when a front seat side airbag circuit reads open, so the SRS light comes on and that airbag may not fire.

Toyota issued bulletins for B0111 and/or B0116 on Siennas from 2004 to 2008 and 2006 to 2008 4Runners, with a new service part and an updated repair procedure for the floor harness and side airbag connections. Complaints show dealers also finding it on an Avalon, where the code cleared and came back.

Which seat the code points to is not consistent in the reports we read, so a technician should read the exact circuit.

Most likely causes

  1. Floor wiring harness or side airbag connector

    Supported by vehicle data
    Why it ranks here
    Toyota bulletins EL001-08 and T-SB-0252-08 give an updated repair or new service part for B0111/B0116 on Siennas, and a Sienna complaint quotes the harness and squib being replaced.
    What would change this
    Rises on a 2004 to 2008 Sienna or a 2006 to 2008 4Runner. Falls if the connectors and harness check good.

  2. Intermittent connection that clears and returns

    Possible — needs testing
    Why it ranks here
    An Avalon owner says the code cleared after a connector check and the light returned.
    What would change this
    Rises if the light comes and goes. Falls if it stays on constantly.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Have the airbag codes read with a scan tool that can talk to the airbag module, and note every code stored.

    Low riskTool: scan tool with airbag (SRS) access

    • IfB0116 is stored, with or without B0111

      It meansA front seat side airbag circuit reads open.

      Go to step 2

    • IfOther airbag codes are stored as well

      It meansA technician should work through them in the order the service manual gives.

      Go to step 3

  2. Give your VIN to the dealer and ask whether a service bulletin or warranty extension covers this code on your car.

    Low risk

    • IfA bulletin or extension applies

      It meansThe dealer repairs it under the bulletin.

      Go to step 3

    • IfNothing applies

      It meansThe circuit still needs a diagnosis.

      Go to step 3

  3. Leave the diagnosis to a dealer or trained technician, who measures the circuit with the service manual procedure.

    Best left to a shopTool: scan tool with airbag access, manufacturer procedure

    Warning:Airbag wiring can set off an airbag if it is probed, disconnected or powered the wrong way, and that can cause serious injury. Do not test or unplug airbag connectors yourself.

Symptoms

  • SRS warning light on or flashing

How to fix

This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.

Parts and cost context

  • Floor wiring harness and side airbag connector:Toyota extended warranty on some Sienna parts; ask before paying. Dealer work. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Toyota

  • 2004–2008 · Sienna

    Supported by vehicle data

    Toyota bulletins prescribe an updated floor harness repair or new part for B0111/B0116 on the Sienna, and an owner reports the harness and squib replaced. Whether the bulletins are still current is not verified.

  • EL001-08Status unverified

    SRS light on, B0111/B0116, open side squib circuit

    2004–2008sienna · issued · NHTSA 10024292

    Repair manual supplement for an open side squib circuit.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0252-08Status unverified

    New service part for B0111 and/or B0116

    2005–2008sienna · issued · NHTSA 10026564

    A new service part is available for Siennas that set these codes.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB-0086-09Status unverified

    New service part for B0111 and/or B0116

    2006–20084runner · issued · NHTSA 10029189

    A new service part has been made available for 4Runners that set these codes.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • B0111Side airbag firing circuit open (Toyota, Lexus)

    Shares causes Supported by vehicle data

    Toyota and Lexus bulletins cover B0111 and B0116 together as an open side squib circuit.

All Airbags and seat-belt restraints (SRS) codes

Sources and review

  1. 2023 Accord Owner's Manual: Airbag System Indicators — American Honda Motor Co.
  2. Camry Owner's Manual (OM06291U) — Toyota
  3. Toyota EL001-08: repair manual supplement, SRS light on, DTC B0111/B0116, open side squib circuit — Toyota Motor Sales ,
  4. Toyota T-SB-0252-08: new service part for vehicles with DTC B0111 and/or B0116 (2005-2008 Sienna) — Toyota Motor Sales ,
  5. NHTSA complaint ODI 890403 (2006 Toyota Sienna) — NHTSA Office of Defects Investigation
  6. NHTSA complaint ODI 603484 (2002 Toyota Avalon) — NHTSA Office of Defects Investigation
Last reviewed
Written by
Saurabh K.
Editorial review
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